Heron's Formula for Triangle Area

A = s (s - a) (s - b) (s - c) (correct)

A = (s + a) (s + b) (s + c)

A = s^2 - a^2 - b^2 - c^2

A = 1/2 * a * b * sin(C)

s = a + b + c

s = 1/2 * (a + b + c) (correct)

s = a * b * c

s = sqrt(a * b * c)

Second-century astronomer Ptolemy

Fifth-century philosopher Plato

Third-century mathematician Euclid

First-century engineer Heron of Alexandria (correct)

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